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If the visual expansion of a square is w² + 6w + 9, what will be the outer side?

Answer and explanation

Correct answer: w + 3

The direct answer is option B: w + 3. Use the identity (a + b)² = a² + 2ab + b². Here the first term w² shows that one part of the side is w, and the constant term 9 = 3² shows that the other part is 3. The middle term must then be 2 × w × 3 = 6w, which matches the expression. Hence w² + 6w + 9 = (w + 3)², so the outer side is w + 3. Option A would give (w + 6)² = w² + 12w + 36. Option C would give a negative middle term, w² − 6w + 9. Option D would give a much larger constant and middle term. A useful check is to square every proposed side and compare all three terms, not just the last term.

Related tags

Perfect Square TrinomialVisual ModelsAlgebraic IdentitiesSquare ExpansionVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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